"Einstein's theory was that everything about the laws of the universe and nature was relative. What you observe about something depends greatly upon your frame of reference at the time. That's why I can stand here in this Concorde [jetliner]cabin and drop my pen in comfort. In here I'm not traveling 1,400mph, am I? Everything works like that. Conditioned by its frame of reference. All the electronics in all the instruments in this cockpit obey the exact same laws they would if the plane were standing still. Because in this frame, like me they are not traveling at Mach two. And all the laws of nature behave the same way. This beam of light is going out in all directions at 186,000 miles per second. Being on the concord makes no difference to it's speed going forward, backwards sideways."

"When any good attitude or concept or system worked well, we hung onto it. We preserved representative democracy, intended for a time when only a few could get to the capital to speak for the many. Modern finance was designed in the 17th century. Literacy as a test of intelligence came in the 15th century. The idea of progress is 19th century. And yet, all of those things are part of our mental furniture today, because when the answer to a question -- a solution to a problem -- suits us, we kind of institutionalize it, so that it won't change even when we do. The business of questioning, itself, has been institutionalized like that, in the kind of place that Jodrell Bank telescope belongs to: a university."

"The oldest answers to the most basic questions about how to operate are common to virtually every culture on the planet, because at the simplest level, every culture needs to keep order -- especially this kind: (James Burke displays a wedding ring.) This is one of those things in life we protect most against being changed when knowledge changes us. We protect it by turning it into a ritual. When we get married, or buried, get christened, or anything else too important to play by ear, the event is turned into a kind of play where everybody gets a role they act out. It's a kind of public agreement to stick to the general rules about whatever it is. The people doing it are effectively saying, "No matter what else may change, we won't rock the boat! We're not maverick. You can trust us." Expressions of approval follow. Most of these ritual ways of answering a social need that we got from the past look like it. They include something from an ancient rite -- in this case, the old symbol of fertility: the ring. And then, it's all done in the presence of a supernatural being: a God. So, the agreement is also made under what was once a real threat of heavenly retribution if you broke your promise later on. Some things, this ritual says, must be permanent."